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Q.

The driver of a three - wheeler moving with a speed of 36 km hr sees a child standing in the middle of the road and brings his vehicle at rest in 0.4s just in time to save the child. The average retarding force on the vehicle is (The mass of the three - wheeler is 400kg and the mass of the driver is 65kg)

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a

$1.2 \times 10^{6} N$

b

$1.2 \times 10^{5} N$

c

$1.2 \times 10^{4} N$

d

$1.2 \times 10^{3} N$

answer is B.

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Detailed Solution

$u = 36 x \frac{5}{18} = 10 m / s$

$a = \frac{0 - 10}{0.4} = - 25 m / s^{2}$

$F = ma = (400 + 65) (- 25) = - 11625 N ≃ - 1.2 x 10^{4} N$

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The driver of a three - wheeler moving with a speed of 36 km hr sees a child standing in the middle of the road and brings his vehicle at rest in 0.4s just in time to save the child. The average retarding force on the vehicle is (The mass of the three - wheeler is 400kg and the mass of the driver is 65kg)